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Mathematics 8 Online
OpenStudy (aaronandyson):

1200/x-40 - 1200/x = 20/60

OpenStudy (anonymous):

The answer is in here this is my most trusted website! http://www.wolframalpha.com/input/?i=1200%2fx-40+-+1200%2fx+%3d+20%2f60&incTime=true

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